Patent US4266940A successfully refreshed from Google Patents.
US4266940A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method for dyeing acrylonitrile polymer and copolymer fibres
Assignee: Yorkshire Chemicals Ltd
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Filing: 1979-03-02
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Granted: 1981-05-12
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Expires: 1999-03-02
Abstract
Abstract There is disclosed a process for the coloration of wet spun acrylic and modacrylic fibres in the gel form which comprises using a cationic dye, or its dye bases, which are substantially insoluble in water but soluble or partly soluble in organic solvents. There are also disclosed acrylic fibres so colored.
Inventors
- 👤 David Blackburn
- 👤 Malcolm S. Wild
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 01:40
CPC Classifications
D; D06; D06P; D06P1/00; D06P1/90; D06P3/00; D06P3/70; D06P3/702; Y; Y10; Y10S; Y10S8/00; Y10S8/92; Y10S8/927
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
150 words
A process for the colouration of wet spun acrylic or modacrylic fibres in gel form, said process comprising dyeing said fibres at 20°-110° C. from a bath in which a cationic dye or dye base is dissolved, wherein said bath contains a highly polar organic solvent in which acrylonitrile polymer and copolymer of said fibers are soluble and in which said dye and dye base are soluble or partly soluble; removing said fibres after colouration from said bath; and rinsing said coloured fibres with an aqueous medium without substantially removing said dye from said fibres; wherein said dye has the formula D.sup.+ X.sup.- where D represents a cationic dye radical containing a chromophoric group and X represents an anion that renders the dye substantially insoluble in water; and wherein said highly polar organic solvent is selected from the group consisting of dimethylformamide, dimethylacetamide, dimethylsulphoxide, ethylene glycol carbonate and mixtures thereof.
Claim 2
Dependent Claim
150 words
A process for the colouration of wet spun acrylic or modacrylic fibres in gel form, said process comprising dyeing said fibres at 20°-110° C. from a bath in which a cationic dye or dye base is dissolved, wherein said bath contains a highly polar organic solvent in which acrylonitrile polymer and copolymer of said fibers are soluble and in which said dye and dye base are soluble or partly soluble; removing said fibres after colouration from said bath; and rinsing said coloured fibres with an aqueous medium without substantially removing said dye from said fibres; wherein said dye has the formula D.sup.+ X.sup.- where D represents a cationic dye radical containing a chromophoric group and X represents an anion that renders the dye substantially insoluble in water; and wherein said highly polar organic solvent is selected from the group consisting of dimethylformamide, dimethylacetamide, dimethylsulphoxide, ethylene glycol carbonate and mixtures thereof.
Claim 3
Dependent Claim
22 words
A process as claimed in claim 1, in which the highly polar organic solvent is admixed with another organic solvent or water.
Claim 4
Dependent Claim
28 words
A process as claimed in claim 2, wherein said other solvent is selected from the group consisting of butanol, ethylene glycol, diethylene glycol, 2-methoxyethanol, 2-ethoxyethanol, toluene and xylene.
Claim 5
Dependent Claim
25 words
A process as claimed in claim 1, wherein the chromophoric groups is a monoazo, methine, azomethine, diarylmethane, triarylmethane, oxazine, anthraquinone, naphthostyryl, quinophthalone or benzimidazole group.
Claim 6
Dependent Claim
27 words
A process as claimed in claim 1, wherein the anion X- is chloride, bromide, iodide, carbonate, bicarbonate, sulphate, bisulphate, phosphate, dihydrogenphosphate, perchlorate, benzenesulphonate, p-toluene sulphonate or thiocyanate.
Claim 7
Dependent Claim
21 words
A process as claimed in claim 1, wherein the fibres may be subjected to a stretching treatment during the dyeing process.
Claim 8
Dependent Claim
33 words
A process as claimed in claim 1, wherein after colouration, the gel filaments are subjected to one or more further treatments selected from the group consisting of drawing/stretching, heat treating, crimping and drying.
Claim 9
Dependent Claim
14 words
A process as claimed in claim 1 in which the fibres are acrylic fibres.
Claim 10
Dependent Claim
15 words
A process as claimed in claim 1, wherein X in said cationic dye is thiocyanate.
References Cited (Backward Citations)
GB734974A
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GB992175A
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GB991957A
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US3643270A
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GB1294994A
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GB1483311A
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GB2017156A
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1984-05-11 | 1984-11-10 | 1985-05-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-05-11 | 1988-11-10 | 1989-05-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-05-11 | 1992-11-10 | 1993-05-12 | $7700.00 | Window Closed / Lapsed |